Assiowob to the cleveland worm amd



D. FITZPATRICK.

THREAD GRINDE?.

APPLxcAHoN HLED JUNE 21,2. 191s.

Patented May 11, 1920.

l5 SHEETS-SHEET l.

BSN

D. FUZPATHIK.

THREAD GENDER. APPLICAHM min lum.' 22, :919.

D. FITZPATRICK.

THREAD GRINDER.

aPPLmATxoN min JUNE 22. |918.

1,340,03 1, Patented May 11,1920.

l5 SHEETS-SHEET 3.

/J/wmwuw D. FTZPATICK.

THREAD GRNDER.

APPLICATION mm wnezz, 19m

1,340,031 Patented May 11, 1920.

15 SHEEVSVY SHEET @y D. FITZPATHCK.

THREAD GRfNDER. APPLICAHQN HLEDmN22,191.

Patented May 11, 1920 l5 SHEETS-*SHEET 5* Dl FTZPATRICK.

THREAD GHiNDER. Mmxcmme min 1UNE22, 1918.

Patented May 11, 1920.

l5 SHEETS-SHEET 6.

D. FITZPATHICK. THREAD GRINDER. APPucATioN min JUNE 22, wis.

Patented May 11, 1920.

l5 SHEETSSHEET D. FHZPAUNCK. THREAD GRINDER.

APPLICATION man JUNE 22, nya,

Patented May 11, 1920.

D. HTZPATRICK. THREAD GRiNDER. APPucATloN mw xuuizz. |913.

Patented D. FSTZPATRCK.

THREAD GRINDER.

M'PLICAHON FILED JUNEZZ, |918.

Patented May 11, 1920.

D. FITZPATRICK. THREAD GRINDEH. ArPLxcAmu mu1uNE22.|sxa.

Patented May 11, 1920.

l5 SHLEYSH-SHEET |I NWN D. FITZPATRICK.

THREAD GFHNDER.

APPLLAUQN man juNE 22. :918.

Patented May11,1920.f

D. FITZPATRCK. THREAD GRINDER. APPLlcnrlow man 1Lm22 fers.

' Patented May 11, 1920.

c SHEETSSHEET 14- faz/@afar Q GM d: ffarwe ngi/41?,

D FITZPATRICK. THREAD GRINDEH. APPLacAIN HLED JUNE 22, :amK

Patented May 11, 1920.

l5 SHEETS*SHEET l5.

4UNITED cintresAA PATENT cerros.

DAVID FITZPATRICK, 0F CLEVELAND, OHIO, ASSIGNOR TO THE CLEVELAND WORM AND GEAR. COMPNY, 0F CLEVELAND, OHIO, A CORPORATION 0F OHIO.

THREAD-GRINDER.

Application tiled June 22',

To all whom it may concern:

Be it known that I, DAVID Frrzrn'rnicir, a subject of -rGreat Britain, and resident of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in Threadlrinders, of which the followinff is a specification.

My invention relateerfY o a machine for grinding worms or .similar machine parte having convolute threads. The embodiment oil the invention herein selected 'for illus tration may he considered, when used in connection with certain types of work. as au improvement in some of the features of the machine constituting the subjectsmatter of my co-pgmlihg application Serial No. 43.175, filed August 2, 1915.

In this prior application it was pointed out that in grinding a machined worm to size after tempering the same, it was desirable under some circumstances to provide mechanism for movingr the? grinding tool repeatedly in successive vgrinding: engagements with the different teeth of the worm and that this repeated grinding action he provided without the necessity ot' aufv supen vision of the cyclic repetition of the grindf in;r act Iand that the matuation of the ma chine should be practically automatic from thc beginning to the` cud of the entire `rind-4 iuif of the work.

rThis automatic actuation necessitated the use of some mechanism for mechanirally withdrawing the tool from the worm being round at the endof each grinding traverse and before the work was indexed and for returning. the tool accurately into grindifr engagement with the next succeeding thread to be ground.

As the Worms are required to he ground accurately to oue-fortytholisanrltlis of au inch any loose play in the resetting device would he fatal to the accuracy of the machine.

Under some conditions, especially AWhere the parts were under high tension incidental to forcing the grinding operation, this` grinding tool withdrawing and resetting;A mechanism frequently,T became Worn with resulting inaccuracies in the automatic rc settingr of the tool in its succeeding grriml ini.' operation.

Further when such machines arc designed to grind largo massive worms the structural Specification of Letters Patent.

Patented May 1.1, 19,90.

191s. serial No. 241,405.

parts of the machine must be made of a size to withstand the strains incidental to grinding1 such large Worms and these large massive part.; do not readily lend themselves to the delicate mechanism which must be used to insure the proper automatic reset ting of the grinding tool. at the beginning of each grinding stroke. i

Accordingly, the primary object of this invention is to provide a simplified and therefore inexpensive and at the saine time a rnechanirally pzfrtected machine of the type disclosed which will insure a proper grind ing; of the Inachincd Worm. irrespective of the size or massrencss of the movable parts 'of the machine.

incidental. to this ohiect the invention conY tcu'xplctes an organization of parts which will rotate the work. in proper relation to the advance of the grinding tool and which 'will cause (he grinding tool to enge the work while rotating: at alinorn'udlyv high speed and in inicrcmetricallym light grinding engageant-ut with the slmrly turning lvtllliil.

.inolhi-r object of the invention is to 'prav vide a rcliued. f 'zccurately controlled, manual adjustment for setting;v the grinding tool in an"v desired operative position and in which the actuation ci" all parte. which are not contrihuiory to this refined manual adjust ment. shall iw ai'itcrnatically actuated.

in such machines it is necessary to mount the Igrindingv lool so as to grind both right and luft hand worms ot different pitchland 'to provide a llexihlepowcr transmission be- 1' wer-u the main power shaft of the machine and the adjust-.dile tool. Heretofore this Vlmnsinissiim has heen attained by means of a holt drive which works satisfactory Where ilu-w is littlc or no twist to the heit hut docs uol wos-l1.; economically when the grind-- ingr tool has hccn adjusted into one of, its cxtreme positirms.

.\l.-l'ordingl v another object of the invention is to provide a simple type of flexible transmission which will allov freedom of mliu.-1i'rncot ol' the grinding wheel and which will :it thc samc tiuie. provide an easy run^ nlug. noisclcss' and positively acting power traman'iissiou hctivcci -ihc main power shaft and ihr grinding: tool iu all adjusted posi tions of thc same,

lo geni-ral. lmu'cvcr. the invention contemplates the improving in mechanism and organiz/.ation of the machine parts disclosed in the prior application and in the mechanical perfecting of a machine for accurately and rapidly grinding worms to an exact size with the least cxl'icnditure of energy.

incidental to this desideratum the invention contemplates a construction in which the center of the grinding tool will at all times he alined with the axis of the turning Worm irrespective of the angular position of the tool and in this way there is eliminated any necessity for manually setting the tool vertically with respect to the different helix angle of the Worms to be ground. i ln this embodiment of the invention the grinding tool moves longitudinally with respcct to the turning worm and passes through and in grinding contact with the adjacent faces oi a pairn of: contiguous threads. The machine is usually set so that thc grinding tool passes beyond the cnd of the worm so as to clear the Wormhefor the succeeding indexing movement is inaugurated. The advance of the grinding tool is intercepted automatically at the end of its grinding stroke and thrown into an inoperative position and the worm is automatically indexed; after which by manual movement of a lever the grinding tool is auton'iatically returned by the machine at high speed still following the same lead of the worm to a position opposite its initial position and is then reset manually into any desired grinding engagement with the next succeeding thread trough. The tool is then ready to start on its next succceding grinding operation`r and this c vclc of movement is repeated until the worm is properly ground.

Various other objects add advantages of the invention will be in part oln-ious from an inspection of the accompanying drawings and in part will he moreA fully set forth in the following particular description of one form of mechanism embodying my inventioiuand thc invention also consists in certain new and novel features of construction and combination of parts hereinafter set forth and claimed.

In the accompanying drawings:

Figure 1^ is a view in front elevation of a com )le-.ted machine disclosing a prcfcrrcd embodiment. of my invention with thc worin in position and all machine parts in a normal inoperative position and with a part oiE thc frame broken away to show internal constructicms;

Fig. 2^ is a plan view looking down upon the device shown in Fir. 1^; Y Fig. 3^ is a view in cnil elevation of thc left hand side of the machine shown in Fics. 1^ and 2^;

"im 4^ is a corresponding view at the right` hand side of the machine;

Fig. 4 is an enlarged view of the swivel head tool drive casing shown at the right hand side of Fig. 4^; i

Fig. 4 is a transverse sectional view taken on the line 4-4 of Fig. i and also constituting an enlarged section taken on the line 4U-4" of Fig. 4^ looking in the direction indicated by the arrows;

Fig. 5^ is a vertical sectional view takcn longitudinally of the machine on the center line of the live and dead centersI and on the line 5^5^ of Figs. 3^ and 4^;

Fi 6^ is a vertical sectional view taken longitudinally of the machine, through the carriage feed and on the lineyG^-6^ of Fi s. 2^, 3^ and 4^;

Pig. 7^ is a vertical sectional view taken transversely of the machine through the tool carria e on the line 7^-7^. of l* ig. 2^;

Fig. 8^ is an enlarged detailed view of the main power pulley shown at the left ot Figs. 1^, 2^ and 5^ and of the main driving shaft and gear casing shown in vertical section taken on the line 8^-8^ of Figs. 2^ and 9;

Fig. SB is a vertical sectional view of the reversin clutch for the main tool drive shaft ta Ien on the line BB-S of Figs. 2^ and 9^;

Fig. 8C is a vertical sectional view of the clutch controlling the direction of the tool carriage transverse and taken on the line SC--SC of Figs. 2^, 9^ and 9B;

Fig. 9^ is a vertical sectional view taken through the main drive gear casing shown in plan in Fig. 2^ and taken on the line 9^-9^ of Fig. 2^ looking toward the right of the machine;

Fig. 9D is a similar view lookin in the opposite direction and taken on tie same linc for this purpose lettered 93--93 in Fig. 2^:

Fig. Si is a vertical sectional view through a portion ofthe tool drive reversing lever catch and taken on the line SiC-9C of F ig. 9^;

4` ig. 1ll^ is a Vertical sectional View through the tool driving connection at the rear of the carriage and taken on the line 10^10^ of Figs. 2^ and 10B;

Fig. 1U" is a vertical sectional view taken on the line itin-A0" of Fig. 10^;

Fig. l()c is an enlar red view of the grinding tool and its spind e casing taken axially thereof, enlarging the similar showings in Figs. 7^ and 11^ -and taken on the linel IWL-10" of Fig. 11^;

Fig. 1U" is a transverse sectional view showing the tool spindle adjusting mechanism and taken on the line 10D-10T oi Fig. 10C;

is a vertical sectional view .through the tool carriage and supporting in Fig.

parts enlarging the showing` iig. 2^;

taken on the line 11^-.11^ of Figs. ll.n and 11C are parallel vertical sectional views through the swivel tool carriage head showing the swivel head adjusting Worms and one of the swivel head bixiding devices, sind taken respectively on the line 11B-lili and 11C- llC otFig. 11A;

Fig. 11D is a plan .view oi the tool-headmountin -adjusting device looking down thereon rom the plane llf-l.ll ofl* ig. 11A;

Fig. 12A is a vertical sectional view taken throughfthe head stoel/z and showing an enlargement of the same parts shown in Fi".

iig. 12B is n. horizontal sectional vienv taken on the line 12B-12B of Fig. 12^; l

Fig. 12"V is a vertical sectional View taken on the line 12C-l2 of Figs. 12" and 12;l

Figs. i3" to 15E, inclusive, are enlarged views of portions of the indexing mechanism; Fig. 13A showing the position of the parts when the grinding wheel is in its grinding position and the indexing mechanism inoperative and enlarging the similar showing in Fig. 1A;

Fig. 13" is a vertical sectional view taken axially through the main indexing shaft shown in Fig. 13A;

Figs. 13C and 13 are transverse sectional views through this sheftend taken respectively on the line 13C---13C and 13D- BD of A Fig. 13A; y

Fig. l4^ is a vieiv .similar to Fig. 13A showing the position of the parts with the indexing mechanism in active operation;

Fig. 14B is a vertical sectional view through the main indexing shaft showing the latch releasing trip and taken on the line 14R-14 of Fig. 14A;

Fig. 14C is a view similar to Figs. 13A and 12":- showing the position of these parts o'l" the indexing mechanism when the carriage is on its return traverse;

Fig. 14D is' a view similar to 14 after the leverhas been tripped and taken on. the line lill- 14D of Fig. 14C;

Fig. 15A is a. vertical sectional view of the friction clutch and coieting parts of the indexing mechanism at the left of Fig. 1" and taken lon the `line 15^15^ ot Fim 15B; a

"ign 15B is a vertical sectional view taken on the line i.Bw-l of Fig. 15^;

F ig. 15 is an end view of the parts shown :it thc left of Fig. 15^;

Fig. l5 is a sectional view taken on the line 15u-15 of Fig. 15^ and Fig. 15E is a view similar to that shown. in Fig. 15"? with the stop plete in rotating position.

Frame.

li. thc accompanyinp.` drawings there is shown a lathe type of mach-inc including a hollow 4box like supporting-bed traine. i6, fflcsigzncd to inclose certain parts oi' the mechanism.

The frame includes a front wall 17, a rear Wall 18 and a longitudinally extending partition 19 connecting opposite end walls and tending to brace the entire construction. An open top cooling liquid receiving gutter Q() extends forwardly from the upper portion of the partition to receive the drip Yfrom the tool carriage and to dis-4 charge the same from the lett side of thc machine (F igAlthrough the drip pipe 20'.

Head stock and tail stock.

y5.20 and extends from the head stoel-z 2.1 to

the right end M the frame 16. The upperfront edge ot' the vork table is provided with a V-shaped rib outlining the torward part of the betlring surface provided by the top of the work' table.

A. longitudinnlly movable tail stock 26 is slidably mounted on the work table and is held thereon against transverse movement by means of :i groove 2T in the underside thereof engaging the rib 25, (Fig. 4^). A. pair ol" longitudinally spaced studs are inclined vertically et an angle through the tail stock, as shown in Fig. 4^, with their' heads disposedin the slot 24 and. adapted to be raised into binding;r engagement therewith by the adjustable nuts 2l) threaded to the top of the studs and bearing on the tail stock. The tail stoclr carriesa longitudinally adjustable slide 30 (F ig. 5^) con trolled by an adjusting thumb screw 31 for moving the deed center 32 town rd anc from the live center 33 carried by the head stock.`

The Work W to be ground is centered bct-Ween the pointed end of the live and fiend centers and held to the live center so as to be rotated thereby `n any manner usual in lathe construction. of this character. The dead center is locked in position. bearing on the ai'ljncent end of the work by means of a pair o'l" clamping sai-rc s 34 1arried by the tail stock and designed to bear on the side of the slidG 30.

Tool carriage.

The u pper portion oi the frame 16 n the rear of the tabli` 3f-l provides n support for is provided at its rear side with a depending' guiding rih 3H slidahly mounted in a V-sl1aped groove 3S) formed in aucxteusion 4() at the top of the rear wall lo. The portion of the saddle between the portion 19 and the rear wall is long' compared to the length oi" the frame as shown in Figs. :4^ and G, so as to provide a long hearingir en gagement with the frame. The middle por` tion ot' the saddle is concaved to form a cooling liquid receiving has-iu 4l (Fig. 1l^)r. The lowermost portion ot' the hasin is provided with a drain opening;r l2 discharging the cooling liquid drip into the Ifutter 2U in all positions of the carriage. The l'orward portion of the 4saddle is reduced in width to form a hearing block 43 which rests upon the work tahle and is I niided hy the rib The saddle includes as part of its internal bracingr structure a. pair ot' upstanding transversely disposed walls H and 45 (Fig. 6^) constituting;r a guiding support for the transversely movable swivel head tool mounting $57. The top of the wall l-l is T-shaped and directly supports the main cylindrical hearingr portion 4G of the mounting. The other wall l5 is wider than the wall 44 and is provided with a V-shaped channel. 47 constitutiiug,r a guide for a de.- pending rih 4R formed on a huttress portion 49 which extends toward the head stock end of the machine and depends t'roni thc cylindrical portion of the inounting.. The mountingis 'removably held in position on the saddle hy means of a pair oll plates` 5u fastened to the mounting and underliuipine` the T-headed shoulders formed at the top of the'walls 44 and 45.V A tool carrying swivel head :'11 includes a lower` substantially cylindrical hollow harrel 52 rotatably mounted in the cylindrical portion -lii for rotary movement about a horimmtal axis iudicated hy the line o-rt of Figs. 7^ and ll and an inverted U-shaped arm 52S constituting a. gear train and spindle casing. The cylindrical barrel is reduced and a gear :'34 is shrunk thereon and fastened hy a ke 55 (Fig. 11"). nally of the machine and transversely of the axis of the portion 4G and meshes with the Afear 54 (Figs. 6^ and lt^). This worin has opposite ends mounted in a journal hox 5'? constitntirn;C an upward extension ol the cylindrical part lo. Opposite ends` ot' the worm project helvdnd the extension and are provided with tool engaging heads 5R by means` of either ol which the worin may he rotated to adjust the angular position of the grinding,r tool 59 from the dotted line position shown in Fig. 5", to a position ol' slightly more than 900 in either direction from the dotted line position shown m Fi .5^.

Phe adjusted swivel head is locked in position hy a pair of clamping?r devices 13u sleeve.

A worm 56 extends longitudi-- mounted in the hox 57 on opposite sides of the worm 56. These clamping devices each include a pair of cla-mliing hlocks 61 (Fig. 11") mounted in a guide-way 62 and bearing in one case on the cylindrical part of the harrel 52 or on the extension :62' of the worm 54, A tensioning screw 3 has a left hand threaded portion 64V threaded into one of the clamping blocks and a right hand threaded portion threaded through the opposite block, andso arranged that the rotation of the screw in one direction will canse the blocks to approach each other, hear on and thus clamp the swivel head therebetween and hold the same rigidly fixed to the portion 4G. Thetop of the arm 53 is horizontally disposed and constitutes a housing for a gear train which drives the grinding tool 59 and is closed by means of a top beariin;r plate and -cover 66 fastened in. place by lscrews 6T. The front of the head is provided with an .open front shield 68 surroundingr the tool, the front edge of which projects beyond the front of the head and shield (Figs. 2^ and 7^).

wally.

'lhe grinding tool is adjusted to and from the work in a direction transverse to the axis oi rotation thereof hymeans of a hand wheel` T0 mounted at the front. of the machine (Figs. 1A. 2^ and 11") and provided with a handle Tl conveniently accessible to the operator. This advancing mechanism is carried hy the hearing block 43 constituting the part of the saddle which rests on the work table 23. The mechanism includes a headed sleeve 72 rotatably mounted in the block and projecting forwardly of the front oli" the machine. The sleeve is held i'n position in thohearing block hy means of the hand wheel which is connected thereto hy. means of a key- T3 and fastened in place h v a nut 74 threaded on the outer end of the A screw block T5 is mounted centrallyh in the sleeve 7;). and is held thereto by means of pins 7G. feed screw T7 has one end thereof threaded into the base 78 of the swivel head mounting` and is fixed thereto hy means of a pin 79. The forward end of the screw is threaded through the block T5 and is so arranged that therotation of the hand wheel 70 in one or the other direction will draw the swivel head mountingr and the tool toward and t'i'oin the work, depending upon the direction olf rotation of the hand wheel.

Foc/fing micrometer ('rrl.

'lhe hul S() ol' the hand wheel is reduced 'to form a shoulder H1. and collar 82 encircles thc reduced portion of the hul) and lits hctwccn thc shoulder and the front face of the hlock i125. The collar (Fig. 11") is i tfifln, in n 'nich pnsltinn thi rullini' i, s mi pinviflml with n scale gi'mnziied in iingnA lax es which. il ha wants with :i l m ninth l" nn The tmp nf the hlnih in innhcnln :i pussihle angular rotation nf the siliw: T. The collar frac tn Tritato uhmm the huh so that it muy he: in @nl in any ilvhii'ml pmi i Fw llfyf .he .l unanimi nl n "SEL a 'uw TQS tha-3mi il l lni Lnullen' und migngis'lg in el miliplne ab iannieg-al .in the fuelinml pmtinn nr huh @0.

Li Ling.: minfin :imi

` I'litnlinn in thv apposito (lirm'liinn will anni@ 'the partis inw theJ inopera. .we posit-fm .nu 2^ in which c: se the pulley Shnwn n r *Sinn idle.

The liminn nf hv nmin shalt within the ngi hun hrw gears 105, 10G and 10T (Figi. 5") iiliixell thereto; the geur 105 consiitnhee; lin initial gezunf a gen1' train fm' :lining the nniin shaft 10S nf :l tool minitf niiirhzinism in nw ilirvctinn. anal the geni' ,imihu'y umstiinles thc initial gear nf n non; rziin hir i'ntiitinif this shaft in :in {ip-- )ninth ililisi'ilm. l

'hi hint; rnentnneil gen1 train (Fig. infirmier-1 thv gmslllli (Fig, 2") engaging n niet ini'urniwlizite Ivar MIS.; which meshes wilh i scmnil intermediate gear 110 A M, nini this: in turn lneshes with n ,g n lll. This; final near (Figs. 3^ nil 3") is iufll t0 :x tnntlH-lntvh vlemunt 1.1;' hum; un lill@ #hilft llli 'Tl j wm-sing gein train ilnludes the figniil il?? l'fig. 'in mesh with an inter-- inwiaii ,fig-iii' whiffh in turn Innshes with I ln: inul gwn" lill, helix-il to :i tooth clutch .flmnunt lli. also lnnsc on the shaft lOS.

ilmahln sinh-il lube fifilnfcrh clement .ElG (Mg. W!) is haya@ tn nml sliihihly munnlml npnn thi? ln EHS and is ihfsignml to hv lzinz'nil inn Chiu-hing' migngfrnvnt ith ihm' nl.' ihn igiiauling clutch elementi; 11;` ..sij U5, 5i; in ihive bhv Shaft in either a` inw-: fir' .in il, reversed lliructinn. The poniiinn nl ihn i'liili'h is (-ontl'nllfell hy menus nl. :i han@ hiver l1? mounted nt the hmli nl* the nung' im. 3^ :unl 9^). The 11mm i l nl thv hnvr i5* xwl in the pui'tinn nl' il lullin wl ich in'ojcus oxtm'iorhg nl' thu www# 92 zend the 'mnu' vnll has :i ynkv lll (Fig. 5E) xnil ilheifetn :unl vngnging the nluinln M6. The hwl' 'nii'ius :1 plunger lidi? iwhl lil-chaval lnwmil im im' plata* 'nimh-ibut' ihn will' nf thn 'using ft2. wm'iiieil with three nntclws H2. lh@ plunger is; fnl-veil hy .i spring .W25 if. und im funx. thv pointed vnd 124- irl la alunni? inln inn of ihn nntvhun in the @ih/mf, "wsinnchvs uw su lspnfswl that. w nini ni" Ihre plunger. whim ),nsil'innnil in lw i'iiirivs .nwifn will hohl thv vlntuh in villini' ilii'efvl" im'vi'swl or thv imitnl pnsi i linnn in Vig. n. hinilingj :www his? lnnilr: lhionggn ihn shin nl' the level null innlm l in thi?, plunger fm.' thc pin'- nl ncx'ining ihn plunger from rotating :iliuill ith :kxi :imi ifm); hu usnl fm' Lln.- pnrpnnn nf lniiking; thc` hunger in punition when: in :any rm@ nl iw nnli'lms. By this mn1-lrni1inn it in pmsihln lo sel. thv muc-him.` inn 1h45 pnbitiun En hvn the @onlin nilhnl 'mi n.11): ilirelitinn nur! tn lock. this element of the. ninvhinn win-n isn sut.

UUS

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